Anodic and Cathodic Platinum Dissolution Processes Involve Different Oxide Species

Fuchs T, Briega-Martos V, Drnec J, Stubb N, Martens I, Calle-Vallejo F, Harrington DA, Cherevko S, Magnussen OM (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Angewandte Chemie International Edition Wiley

Book Volume: 62

Article Number: e202304293

Journal Issue: 34

DOI: 10.1002/anie.202304293

Abstract

The degradation of Pt-containing oxygen reduction catalysts for fuel cell applications is strongly linked to the electrochemical surface oxidation and reduction of Pt. Here, we study the surface restructuring and Pt dissolution mechanisms during oxidation/reduction for the case of Pt(100) in 0.1 M HClO4 by combining operando high-energy surface X-ray diffraction, online mass spectrometry, and density functional theory. Our atomic-scale structural studies reveal that anodic dissolution, detected during oxidation, and cathodic dissolution, observed during the subsequent reduction, are linked to two different oxide phases. Anodic dissolution occurs predominantly during nucleation and growth of the first, stripe-like oxide. Cathodic dissolution is linked to a second, amorphous Pt oxide phase that resembles bulk PtO2 and starts to grow when the coverage of the stripe-like oxide saturates. In addition, we find the amount of surface restructuring after an oxidation/reduction cycle to be potential-independent after the stripe-like oxide has reached its saturation coverage.

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Christian-Albrechts-Universität zu Kiel DE Germany (DE) European Synchrotron Radiation Facility (ESRF) FR France (FR) University of Victoria (UVic) CA Canada (CA) University of Basque Country / Universidad del Pais Vasco (UPV) / Euskal Herriko Unibersitatea (EHU) ES Spain (ES)

How to cite

APA:

Fuchs, T., Briega-Martos, V., Drnec, J., Stubb, N., Martens, I., Calle-Vallejo, F.,... Magnussen, O.M. (2023). Anodic and Cathodic Platinum Dissolution Processes Involve Different Oxide Species. Angewandte Chemie International Edition, 62(34). https://doi.org/10.1002/anie.202304293

MLA:

Fuchs, Timo, et al. "Anodic and Cathodic Platinum Dissolution Processes Involve Different Oxide Species." Angewandte Chemie International Edition 62.34 (2023).

BibTeX: Download